Overview

• The RD‑171MV oxygen‑kerosene engine produced roughly 800 tonnes of thrust during the ground run at the NITs RKP test center in Peresvet on October 10.
• Roscosmos reported the test as successful and framed it as a key milestone toward launching Soyuz‑5 from Baikonur before year‑end.
• Local residents and a regional Telegram channel shared videos of a large white vapor cloud and described a prolonged loud roar and ground vibrations near the site.
• Officials have not reported damage or anomalies, and observers noted such visual and acoustic effects occur with routine engine testing at the facility.
• The corporation described the tested article as the first stage for a prospective super‑heavy‑class rocket, and said the run also checked interactions of onboard systems.